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xen-devel
Re: [Xen-devel] 2.4.29-xenU VBD performance (problem)
On Wed, Feb 16, 2005 at 11:14:50PM -0000, Ian Pratt wrote:
>
> > Both the dom0 and domU were using 128 MB of RAM. I tested with:
> > "dd if=/dev/zero of=/dev/foo bs=1024k count=2048". That makes
> > 2 GB of data to
> > write, so that will definitely not fit in the RAM / buffers. I ran the
> > "test" three times on each kernel to be sure about the result.
> > The CPU in the test-box was 3 GHz P4 with 1 MB of l2-cache.
> > The box (both
> > the dom0 and domU) were idle besides running the test.
>
> Have you tried enabling hyperthreading and running the dom0 and domU's on
> different threads?
>
I enabled hyperthreading and ran dom0 with cpu0 and domU with cpu1.
dom0 performance remained the same as previously (93 MB/sec).
2.6.10-xenU performance increased from 58 MB/sec -> 69 MB/sec.
2.4.29-xenU performance remained the same at 23 MB/sec.
It seems that enabling hyperthreading and running domains with different
(virtual) cpu:s increase performance.
Hyperthreading enabled, but running domU with same (virtual) cpu as dom0
caused the performance to be the same as with hyperthreading disabled.
> We haven't done any testing with software raid 5 systems. It's possible the
> extra CPU burnt by dom0 is causing bad scheduling interactions.
>
It might be.. anyway, 2.4-domU performance is really bad..
-- Pasi Kärkkäinen
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